>> Sujeet,>>>> Once again, I cannot quite follow your proof. (I do agree with your>> solution.) I see why point M must be inside triangle ABC and why angle >> CBM>> = 10 degrees, but I do not see how the given and constructed angles show>> that angle BCM = 20 degrees. (Again, I agree that angle BCM = 20 degrees,>> but I cannot tell which statements justify this conclusion.)>>>> I have supposed that the vertices A, B, C, D are in counterclockwise>> order, but I believe that the same reasoning would apply if they are>> considered to be in clockwise order.>>>> Are my questions clear? Can you help me? Thank you for any response.>> Mary Krimmel